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Finding the Fourth Proportional to 318.48, 439.35 and 225.24

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Solution

The fourth proportional to 318.48, 439.35 and 225.24 is: 310.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.48 : 439.35 = 225.24 : x
  2. Step 2: Convert to fraction form
    318.48/439.35 = 225.24/x
  3. Step 3: Cross multiply
    318.48x = 439.35 × 225.24
  4. Step 4: Simplify right side
    318.48x = 98,959.19
  5. Step 5: Solve for x
    x = 98,959.19/318.48
  6. Step 6: Final answer
    x = 310.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.